Effect of filling pressure on Thermal Reignition Performance of free burning ultra-high Pressure Nitrogen arc
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- Institutt for elkraftteknikk 
The aim of this thesis is to study the thermal reignition characteristics of the free burning arc in SC nitrogen medium. Rate of change of current before interruption and rate of rise of recovery voltage (RRRV) after interruption has been varied throughout the experiment. To investigate the effect of pressure on reignition after current zero, the interruption chamber is filled with 3 different filling pressure. Resonant charging circuit using inductors and capacitors are used to apply the voltage across the electrodes before and after current interruption. This experiment is conducted at atmospheric pressure (1bar), 20 and 40 bar pressure. For simplicity, the scope of this thesis is limited to only free burning arc. It has been observed that, filling pressure does not have a strong influence on the reignition in free-burning nitrogen arc. No clear improvement in reignition performance in supercritical state has been observed from the experiment. One of the reason behind such behaviour can be due to absence of active cooling mechanism in free burning arc.